Expanding on the potential behind the double dynamic driver system found in the Truthear x Crinacle Zero, the Zero:RED is a result of a passion project that takes the limits of dynamic drivers and throws them aside to create something beyond special. Tuned to the IEF target, the Zero:RED is unapologetically tuned to what Crinacle believes is what an IEM should sound. Including an 10 Ohm impedance adapter, the reworked crossovers allow for freedom in the low end, allowing for you to decide how much bass you want.